TM
MP6400 -- LOW QUIESCENT CURRENT PROGRAMMABLE-DELAY SUPERVISORY CIRCUIT
PIN FUNCTIONS
QFN
Pin #
TSOT
Pin #
Name Description
RESET
is an open drain signal which will be asserted when the SENSE voltage
MR
drops below a preset threshold or when the manual reset (
) pin drops to a logic
delay time is programmable from 2.1ms to 10s by using external
capacitors. A pull-up resistor bigger than 10k should be connected this pin to
RESET
RESET
6
1
low. The
RESET
outputting a higher voltage than VCC is allowable.
supply line, and the
5
4
2
3
GND
Ground.
MR
) can introduce another logic signal to control the
RESET
. It is
MR
The manual reset (
internally connected to VCC through a 90kΩ resistor.
Programmable reset delay time pin. When CDELAY connected to VCC through a
resistor between 50kΩ and 200kΩ, a 380ms delay time is selected. When CDELAY
floated, the delay time is 24ms. A capacitor bigger than 150pF connected CDELAY to
GND could be used to get the user’s programmable time from 2.1ms to 10s.
3
4
CDELAY
SENSE pin is connected to the monitored system voltage. When the monitored
RESET
2
1
5
6
SENSE
VCC
voltage is below desired threshold,
is asserted.
Supply voltage. A 0.1uF decoupling ceramic capacitor should be put close to this
pin.
DETAIL DESCRIPTION
The MP6400 product family asserts a
RESET
output remains asserted for
programmable delay time. Two fixed
a
user’s
delay
RESET
signal when either the SENSE pin voltage is
MR
lower than VIT or the manual reset ( ) is driven
low. The MP6400 family can be monitored a fixed
voltage from 0.9V to 5.0V, while the
MP6400DG(J)-01 can monitor any voltage above
times are user-selectable: 380ms delay time by
connecting the CDELAY pin to VCC, and 24ms delay
time by leaving the CDELAY pin float. Any delay
time from 2.1ms to 10s could be gotten by
connecting a capacitor between CDELAY and GND.
The wide monitor voltage and programmable
reset delay time make MP6400 product family
suitable for a broad array of applications.
0.4V by adjusting the external resistor divider.
MR
After both the manual reset (
) and SENSE
RESET
voltages exceed their thresholds, the
MP6400 Rev. 1.0
9/7/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
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